alexatts – Rev 2

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#!/usr/bin/env nodejs
///////////////////////////////////////////////////////////////////////////
//  Copyright (C) Wizardry and Steamworks 2018 - License: GNU GPLv3      //
//  Please see: http://www.gnu.org/licenses/gpl.html for legal details,  //
//  rights of fair usage, the disclaimer and warranty conditions.        //
///////////////////////////////////////////////////////////////////////////
 
const Gpio = require('onoff').Gpio
const mqtt = require('mqtt')
const YAML = require('yamljs');
const winston = require('winston')
const picoSpeaker = require('pico-speaker')
 
// Load configuration file.
const config = YAML.load('config.yml')

// Define configuration for pico TTS.
var picoConfig = {
  AUDIO_DEVICE: config.card,
  LANGUAGE: config.language
};

// Initialize with config
picoSpeaker.init(picoConfig)

// Generate GPIO pins for configuration.
var ATTS = {};
for(var i in config.GPIO) {
  if(!config.GPIO.hasOwnProperty(i))
    continue;
 
  if(config.GPIO[i] === -1)
    continue;
 
  ATTS[i] = new Gpio(config.GPIO[i], 'out')
}
 
// Set up logger.
winston.add(winston.transports.File, {filename: config.log})
 
// Initiate connection to MQTT.
const client  = mqtt.connect(config.mqtt.url, {queueQoSZero: false})
 
client.on('connect', function () {
  winston.info('Connected to MQTT server')
  client.subscribe(config.mqtt.topic)
})
 
client.on('message', function (topic, message) {
  if(message.length === 0)
    return;
 
  // Remove any retained message.
  client.publish(topic, "", {retain: true})
 
  message = message.toString()
  winston.info('Received message: ' + message)

  ATTS["ptt"].write(1, (err) => {
    if(err) {
      winston.err('Unable to press push-to-talk button: ' + err.message)
      return;
    }

    // Send the message.
    picoSpeaker.speak(config.alexa + ", Simon says, " + message).then(function() {
      winston.info('Message ' + message + ' sent to Alexa.')

      ATTS["ptt"].write(0)
    }.bind(this));
  })
})